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:Ratio of catchment (A<sub>c</sub>) to the practice footprint area (A<sub>p</sub>). ''syn.'' I/P ratio. For [[green roofs]] (and often permeable paving systems) this will be 1:1. In [[bioretention]] it may be 15 or 20 to 1.
:Existing rise of swale gradient (length, usually m)
:Void ratio, as usually applied to aggregates and yard materials. In this guide, it is also applied to native soils in lieu of porosity (unit for both are vol/vol, i.e. dimensionless)
no edit summary
;I :Thornthwaite annual heat index (-)
;I :Thornthwaite annual heat index (-)
;L
;L :Length, e.g. of a reach, channel or swale (usually in m)
:Length, e.g. of a reach, channel or swale (usually in m)
;m
;m :run of side slopes in channel cross sections (length, but usually expressed as a ratio in relation to rise. e.g. side slopes = 1:3, so m = 3)
:run of side slopes in channel cross sections (length, but usually expressed as a ratio in relation to rise. e.g. side slopes = 1:3, so m = 3)
;n
;n :Manning's coefficient (unitless) Note: for clarity porosity is being expressed as 'void ratio' and sharing the notation V<sub>R</sub>
:Manning's coefficient (unitless) Note: for clarity porosity is being expressed as 'void ratio' and sharing the notation V<sub>R</sub>
;P
;N :Number of days in the month
:Perimeter of infiltration practice or swale x-section (m)
;q
;P :Perimeter of infiltration practice or swale x-section (m)
:Infiltration rate in (length per time, usually mm/hr)
;q'
;q :Infiltration rate in (length per time, usually mm/hr)
:Infiltration coefficient in (length per time, usually mm/hr) after application of safety correction factor (SCF)
;Q<sub>p</sub>
;q':Infiltration coefficient in (length per time, usually mm/hr) after application of safety correction factor (SCF)
:Peak flow in units of volume per time (e.g. m<sup>3</sup>/s)
;R
;Q<sub>p</sub> :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s)
;R<sub>a</sub>
;R :Ratio of catchment (A<sub>c</sub>) to the practice footprint area (A<sub>p</sub>). ''syn.'' I/P ratio. For [[green roofs]] (and often permeable paving systems) this will be 1:1. In [[bioretention]] it may be 15 or 20 to 1.
;R<sub>b</sub>
;R<sub>a</sub> :Existing rise of swale gradient (length, usually m)
:Rise of compensation gradient for an enhanced swale (length, usually m)
;RVC<sub>T</sub>
;R<sub>b</sub> :Rise of compensation gradient for an enhanced swale (length, usually m)
:Runoff volume control target (as outlined by MOECC, units are mm)
;S<sub>0</sub>
;RVC<sub>T</sub> :Runoff volume control target (as outlined by MOECC, units are mm)
:Longitudinal slope (m/m, i.e. dimensionless)
;S<sub>x</sub>
;S<sub>0</sub> :Longitudinal slope (m/m, i.e. dimensionless)
:Cross slope (m/m, i.e. dimensionless)
;SCF
;S<sub>x</sub> :Cross slope (m/m, i.e. dimensionless)
:Safety correction factor (dimensionless)
;t
;SCF :Safety correction factor (dimensionless)
:time (usually in hrs)
;T
;t :time (usually in hrs)
:Temperature (°C)
;V
;T :Temperature (°C)
:Volume (usually in m<sup>3</sup>)
;V<sub>R</sub>
;V :Volume (usually in m<sup>3</sup>)
;y
;V<sub>R</sub> :Void ratio, as usually applied to aggregates and yard materials. In this guide, it is also applied to native soils in lieu of porosity (unit for both are vol/vol, i.e. dimensionless)
:Depth of water (length, usually m or sometimes mm)
;y :Depth of water (L, usually m or sometimes mm)